The Mamiya ZD, even in its current iteration is a powerful camera. Engineers in Japan will need to ensure that the image processing time is short enough to make the camera a viable option in the studio or in the field, but aside from the buffering times and the image-quality quirks of the early version firmware, the Mamiya ZD is already good to go.
When it ships, the ZD will be lighter than the Canon 1Ds Mark II, with nearly twice the resolution of the Nikon D2X, and vastly more lenses than the Olympus E system. If the company can bring the price in line (a few thousand more than a Canon 1Ds Mark II, but less than a AFD plus back) will make this a very powerful addition to Mamiya’s lineup.